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Solution of the Impala Gold Company Case Study 2-28 (p. 69)
This problem has 6 decision variables defined as followsGround asF C
1 X1F X1CShaft # 2 X2F X2C
3 X3F X3C
where XIJ is the number of tons of rock ground in shaft I = 1,2,3 that are groundas J = F, C.
Shaft constraints:X1F + X1C
CF240,0000
F = X1F + X2F + X3FC = X1C + X2C + X3C
250,000 The equation of the line is(250,000/240,000) F + C = 250,000
So, the constraint is(250,000/240,000) F + C